关键词: 苯并噁唑, 紫外, 荧光, 寿命

Abstract: Absorption spectra, emission spectra and fluorescence yield were measured for thirty-eihgt benzoxazolyl-substituted compounds. From the data radiative and nonradiative lifetimes of the first-excited singlet state were calculated. It is found that the influence of nonpolar substituted groups of the benzoxazolyl on the radiative and nonradiative rates is unremarkable, whereas the influence of polar substituted groups is remarkable. In phenyl compounds, benzoxazolyl groups enhance fluorescence by increasing the rate of the radiative. In vinyl compound benzoxazolyl decrease the rate of nonradiative deactivation. This phenomena is connected with the configuration change which occurs in.photo-excitation process.

Key words: Benzoxazole, UV, Fluorescence, Lifetime